	<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <!-- 一级标题 -->
              <ul class="clearfix">
                <li>
                  <a @click="searchOne(null, null)" title="全部" href="#"
                    >全部</a
                  >
                </li>
                <li
                  v-for="(subject, index) in subjects"
                  :key="subject.id"
                  :class="{ active: oneIndex == index }"
                >
                  <a
                    @click="searchOne(subject.id, index)"
                    :title="subject.title"
                    href="#"
                    >{{ subject.title }}</a
                  >
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <!-- 二级标题 -->
              <ul class="clearfix">
                <li>&nbsp;</li>
                <li
                  v-for="(subjectTwo, index) in subjectsTwo"
                  :key="subjectTwo.id"
                  :class="{ active: twoIndex == index }"
                >
                  <a
                    @click="searchTwo(subjectTwo.id, index)"
                    :title="subjectTwo.title"
                    href="#"
                    >{{ subjectTwo.title }}</a
                  >
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{ 'current bg-orange': Element === 0 }">
                <a title="默认" href="#" @click.prevent="orderElement(0)"
                  >默认</a
                >
              </li>

              <li
                :class="{ 'current bg-orange': courseParam.buyCountSort != '' }"
              >
                <a title="关注度" href="#" @click.prevent="orderElement(1)"
                  >销量</a
                >
                <span :class="{ hide: courseParam.buyCountSort != '' }">↓</span>
              </li>
              <li
                :class="{
                  'current bg-orange': courseParam.gmtCreateSort != '',
                }"
              >
                <a title="最新" href="#" @click.prevent="orderElement(2)"
                  >最新&nbsp;</a
                >
                <span :class="{ hide: courseParam.gmtCreateSort != '' }"
                  >↓</span
                >
              </li>
              <li :class="{ 'current bg-orange': courseParam.priceSort != '' }">
                <a title="价格" href="#" @click.prevent="orderElement(3)"
                  >价格&nbsp;
                </a>
                <span :class="{ hide: courseParam.priceSort != '' }">↓</span>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="courseInfo.total == 0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam"
              >没有相关数据，小编正在努力整理中...</span
            >
          </section>
          <!-- /无数据提示 结束-->
          <article class="comm-course-list" v-if="courseInfo.total > 0">
            <ul class="of" id="bna">
              <li v-for="course in courseInfo.items" :key="course.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img
                      :src="course.cover"
                      class="img-responsive"
                      :alt="course.title"
                    />
                    <div class="cc-mask">
                      <a
                        :href="'/course/' + course.id"
                        title="开始学习"
                        class="comm-btn c-btn-1"
                        >开始学习</a
                      >
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a
                      :href="'/course/' + course.id"
                      :title="course.title"
                      class="course-title fsize18 c-333"
                      >{{ course.title }}</a
                    >
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span
                      class="fr jgTag bg-green"
                      v-if="Number(course.price) === 0"
                    >
                      <i class="c-fff fsize12 f-fA">免费 </i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{ course.buyCount }}人学习</i>
                      |
                      <i class="c-999 f-fA">{{ course.viewCount }}评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a
              :class="{ undisable: !courseInfo.hasPrevious }"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)"
              >首</a
            >
            <a
              :class="{ undisable: !courseInfo.hasPrevious }"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(courseInfo.current - 1)"
              >&lt;</a
            >
            <a
              v-for="page in courseInfo.pages"
              :key="page"
              :class="{
                current: courseInfo.current == page,
                undisable: courseInfo.current == page,
              }"
              :title="'第' + page + '页'"
              href="#"
              @click.prevent="gotoPage(page)"
              >{{ page }}</a
            >
            <a
              :class="{ undisable: !courseInfo.hasNext }"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(courseInfo.current + 1)"
              >&gt;</a
            >
            <a
              :class="{ undisable: !courseInfo.hasNext }"
              href="#"
              title="末页"
              @click.prevent="gotoPage(courseInfo.pages)"
              >末</a
            >
            <div class="clear" />
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import courseApi from "@/api/index/course";
export default {
  data() {
    return {
      courseParam: {
        currentPage: 1,
        pageSize: 8,
        subjectParentId: "",
        subjectId: "",
        buyCountSort: "",
        priceSort: "",
        gmtCreateSort: "",
      },
      courseInfo: {}, //课程的信息

      oneIndex: -1,
      twoIndex: -1,
      Element: 0,
      subjects: [], //所有subject信息
      subjectsTwo: [], //二级分类subject
    };
  },
  created() {
    //查询所有课程
    this.initCourse();
    //查询所有一级分类
    this.initSubject();
  },
  mounted() {},

  methods: {
    //查询排序条件
    orderElement(value) {
      switch (value) {
        case 0: {
          this.Element = 0;
          this.courseParam.buyCountSort = "";
          this.courseParam.gmtCreateSort = "";
          this.courseParam.priceSort = "";
          break;
        }
        case 1: {
          this.Element = -1;
          this.courseParam.priceSort = "";
          this.courseParam.gmtCreateSort = "";
          this.courseParam.buyCountSort = value;
          break;
        }
        case 2: {
          this.Element = -1;
          this.courseParam.priceSort = "";
          this.courseParam.buyCountSort = "";
          this.courseParam.gmtCreateSort = value;
          break;
        }
        case 3: {
          this.Element = -1;
          this.courseParam.gmtCreateSort = "";
          this.courseParam.buyCountSort = "";
          this.courseParam.priceSort = value;
          break;
        }
      }
      this.gotoPage(1);
    },

    //查询二级条件
    searchTwo(subjectTwoId, index) {
      this.courseParam.subjectId = subjectTwoId;
      this.twoIndex = index;
      this.gotoPage(1);
    },

    //查询一级条件  删除二级缓存  然后请
    searchOne(parentId, index) {
      this.subjectsTwo = [];
      this.twoIndex = -1;
      this.courseParam.subjectId = "";
      if (parentId == null) {
        this.subjectsTwo = [];
        this.courseParam.subjectParentId = "";
        this.oneIndex = -1;
        this.twoIndex = -1;
        this.gotoPage(1);
      }
      this.oneIndex = index;
      console.log("parentId", parentId);
      this.courseParam.subjectParentId = parentId;
      this.gotoPage(1);
      this.subjects.forEach((subject) => {
        if (subject.id === parentId) this.subjectsTwo = subject.children;
        //函数体
      });
    },

    //初始化第一次数据
    initCourse() {
      courseApi.getCourseList(this.courseParam).then((response) => {
        this.courseInfo = response.data.data;
      });
    },

    //初始化第一次一级分类
    initSubject() {
      courseApi.getSubjetList().then((response) => {
        this.subjects = response.data.data;
      });
    },

    //分页切换
    gotoPage(page) {
      this.courseParam.currentPage = page;
      // console.log("@@@", this.courseParam.subjectParentId);
      courseApi.getCourseList(this.courseParam).then((response) => {
        this.courseInfo = response.data.data;
        console.log(this.courseInfo);
      });
    },
  },
};
</script>

<style  scoped>
.active {
  background: #bdbdbd;
}
.hide {
  display: none;
}
.show {
  display: block;
}
</style>>
